impaction

impactionimpaction[imˈpækʃən]n.1.■装紧,压紧

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impaction[im'pækʃən]n.1.■撞击；冲击；碰撞2.■压紧；装紧；楔牢3.■【医学】阻生；嵌塞

impactionimpaction[imˈpækʃən]n.1.■装紧, 压紧2.■撞击; 碰撞法3.■【医】阻生; 嵌入, 阻塞food impaction食物嵌塞inertial impaction惯性撞击